:root{--navy:#0D1F3C;--navy-mid:#1B3C6E;--blue:#1E6FD9;--blue-light:#E8F0FB;--bg:#F7F8FC;--bg2:#EEF1F8;--text:#1A2332;--muted:#5D6B82;--line:#D4DCE8;--white:#FFFFFF;--mono:'JetBrains Mono',monospace;--sans:'DM Sans',sans-serif;--display:'Syne',sans-serif}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}
nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(13,31,60,0.97);backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,0.07)}
.nav-inner{max-width:1100px;margin:0 auto;padding:0 2rem;display:flex;align-items:center;justify-content:space-between;height:60px}
.nav-logo{font-family:var(--display);font-size:1rem;font-weight:700;color:#fff;text-decoration:none}.nav-logo span{color:var(--blue)}
.nav-burger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px;background:none;border:none}
.nav-burger span{display:block;width:22px;height:2px;background:#fff;border-radius:2px;transition:all .3s}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-links{display:flex;gap:1.2rem;list-style:none;align-items:center}
.nav-links a{font-size:.7rem;color:rgba(255,255,255,.6);text-decoration:none;letter-spacing:.05em;font-weight:500;text-transform:uppercase;transition:color .2s;white-space:nowrap}
.nav-links a:hover{color:#fff}
@media(max-width:900px){
  .nav-burger{display:flex}
  .nav-links{display:none;position:absolute;top:60px;left:0;right:0;background:rgba(13,31,60,.98);flex-direction:column;gap:0;padding:.5rem 0;border-bottom:1px solid rgba(255,255,255,.1)}
  .nav-links.open{display:flex}
  .nav-links li{width:100%}
  .nav-links a{display:block;padding:.75rem 2rem;font-size:.8rem;border-bottom:1px solid rgba(255,255,255,.05)}
}
.hero{min-height:100vh;background:var(--navy);display:flex;align-items:center;padding:80px 2rem 60px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 60% 60% at 70% 50%,rgba(30,111,217,.1) 0%,transparent 70%);pointer-events:none}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);background-size:60px 60px;pointer-events:none}
.hero-inner{max-width:1100px;margin:0 auto;width:100%;display:grid;grid-template-columns:1fr auto;align-items:center;gap:4rem;position:relative;z-index:2}
.hero-tag{display:inline-flex;align-items:center;gap:.5rem;background:rgba(30,111,217,.12);border:1px solid rgba(30,111,217,.28);border-radius:99px;padding:.3rem .9rem;margin-bottom:1.5rem}
.hero-tag span{font-family:var(--mono);font-size:.7rem;color:rgba(100,160,255,.9);letter-spacing:.07em}
.hero-dot{width:6px;height:6px;border-radius:50%;background:#4ade80;animation:pulse 2s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
h1{font-family:var(--display);font-size:clamp(2.4rem,5vw,3.8rem);font-weight:700;color:#fff;line-height:1.1;margin-bottom:1rem;letter-spacing:-.02em}
h1 span{color:var(--blue)}
.hero-sub{font-size:1rem;color:rgba(255,255,255,.8);max-width:500px;margin-bottom:2rem;font-weight:300;line-height:1.85}
.hero-tags{display:flex;flex-wrap:wrap;gap:.45rem;margin-bottom:2.5rem}
.tag{font-family:var(--mono);font-size:.68rem;padding:.3rem .75rem;border-radius:4px;background:rgba(255,255,255,.08);color:rgba(255,255,255,.8);border:1px solid rgba(255,255,255,.18)}
.hero-cta{display:flex;gap:1rem;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;padding:.7rem 1.4rem;border-radius:6px;font-size:.88rem;font-weight:500;text-decoration:none;transition:all .2s}
.btn-primary{background:var(--blue);color:#fff}.btn-primary:hover{background:#1a5fc0}
.btn-ghost{background:transparent;color:rgba(255,255,255,.65);border:1px solid rgba(255,255,255,.18)}.btn-ghost:hover{background:rgba(255,255,255,.06);color:#fff}
.hero-photo{width:270px;height:330px;border-radius:12px;object-fit:cover;object-position:top;border:2px solid rgba(255,255,255,.25);position:relative;z-index:2}
section{padding:80px 2rem}
.container{max-width:1100px;margin:0 auto}
.sec-label{font-family:var(--mono);font-size:.7rem;color:var(--blue);letter-spacing:.12em;text-transform:uppercase;margin-bottom:.6rem;display:block}
.sec-title{font-family:var(--display);font-size:clamp(1.6rem,3vw,2.1rem);font-weight:700;color:var(--navy);margin-bottom:.4rem;letter-spacing:-.02em}
.sec-line{width:36px;height:3px;background:var(--blue);border-radius:2px;margin-bottom:3rem}
#about{background:var(--white)}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:start}
.about-text p{font-size:1rem;color:var(--muted);line-height:1.9;margin-bottom:1rem;font-weight:300}
.about-text p strong{color:var(--text);font-weight:500}
.stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:.85rem}
.stat-card{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:1.2rem 1.4rem}
.stat-num{font-family:var(--display);font-size:2rem;font-weight:700;color:var(--navy-mid);line-height:1}
.stat-label{font-size:.8rem;color:var(--muted);margin-top:.3rem}
#experience{background:var(--bg)}
.timeline{position:relative;padding-left:1.75rem}
.timeline::before{content:'';position:absolute;left:0;top:8px;bottom:0;width:2px;background:var(--line)}
.tl-item{position:relative;margin-bottom:2.25rem;padding-left:1.25rem}
.tl-dot{position:absolute;left:-2.2rem;top:7px;width:11px;height:11px;border-radius:50%;background:var(--white);border:2px solid var(--line)}
.tl-item:first-child .tl-dot{background:var(--blue);border-color:var(--blue)}
.tl-date{font-family:var(--mono);font-size:.72rem;color:var(--muted);letter-spacing:.05em;margin-bottom:.25rem}
.tl-role{font-family:var(--display);font-size:1.05rem;font-weight:600;color:var(--navy);margin-bottom:.15rem}
.tl-company{font-size:.88rem;color:var(--blue);margin-bottom:.5rem}
.tl-company span{color:var(--muted)}
.tl-desc{font-size:.88rem;color:var(--muted);line-height:1.8;font-weight:300}
.current-badge{display:inline-flex;align-items:center;gap:.3rem;background:rgba(74,222,128,.1);border:1px solid rgba(74,222,128,.25);border-radius:99px;padding:.18rem .6rem;font-size:.68rem;color:#16a34a;font-family:var(--mono);margin-left:.65rem;vertical-align:middle}
.current-badge::before{content:'';width:5px;height:5px;border-radius:50%;background:#4ade80}
#skills{background:var(--white)}
.skills-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:.9rem}
.skill-card{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:1.2rem 1.4rem;transition:border-color .2s}
.skill-card:hover{border-color:var(--blue)}
.skill-icon{font-family:var(--mono);font-size:.65rem;color:var(--blue);letter-spacing:.08em;margin-bottom:.65rem;background:var(--blue-light);display:inline-block;padding:.18rem .5rem;border-radius:3px}
.skill-title{font-size:.9rem;font-weight:600;color:var(--navy);margin-bottom:.4rem}
.skill-list{font-size:.8rem;color:var(--muted);line-height:1.8}
#research{background:var(--navy)}
#research .sec-label{color:rgba(100,160,255,.75)}
#research .sec-title{color:#fff}
#research .sec-line{background:rgba(30,111,217,.5)}
.research-card{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.09);border-radius:12px;padding:2rem}
.research-card h3{font-family:var(--display);font-size:1.25rem;font-weight:600;color:#fff;margin-bottom:.9rem}
.research-card p{font-size:.92rem;color:rgba(255,255,255,.55);line-height:1.85;font-weight:300;margin-bottom:1.1rem}
.research-card p strong{color:rgba(255,255,255,.8)}
.research-tags{display:flex;flex-wrap:wrap;gap:.45rem}
.rtag{font-family:var(--mono);font-size:.68rem;padding:.28rem .65rem;background:rgba(30,111,217,.14);border:1px solid rgba(30,111,217,.24);border-radius:4px;color:rgba(180,210,255,.85)}
#patents{background:var(--bg)}
.pub-grid{display:grid;grid-template-columns:1fr 1fr;gap:.9rem}
.pub-card{background:var(--white);border:1px solid var(--line);border-radius:10px;padding:1.4rem;display:flex;flex-direction:column;gap:.45rem}
.pub-type{font-family:var(--mono);font-size:.65rem;color:var(--blue);letter-spacing:.09em;background:var(--blue-light);padding:.18rem .5rem;border-radius:3px;align-self:flex-start}
.pub-title{font-size:.95rem;font-weight:600;color:var(--navy);line-height:1.4}
.pub-detail{font-size:.82rem;color:var(--muted);line-height:1.75}
#contact{background:var(--navy);padding-bottom:60px}
#contact .sec-title{color:#fff}
#contact .sec-label{color:rgba(100,160,255,.75)}
#contact .sec-line{background:rgba(30,111,217,.45)}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(195px,1fr));gap:.9rem}
.contact-item{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:10px;padding:1.2rem 1.4rem;text-decoration:none;transition:background .2s;display:flex;flex-direction:column;gap:.3rem}
.contact-item:hover{background:rgba(255,255,255,.08)}
.c-label{font-family:var(--mono);font-size:.65rem;color:rgba(100,160,255,.7);letter-spacing:.1em}
.c-val{font-size:.88rem;color:rgba(255,255,255,.7);font-weight:300}
footer{background:rgba(0,0,0,.25);border-top:1px solid rgba(255,255,255,.05);padding:1.4rem 2rem;text-align:center}
footer p{color:rgba(255,255,255,.75);font-family:var(--mono);font-size:.75rem}
footer p{font-size:.75rem;color:rgba(255,255,255,.25);font-family:var(--mono)}
.fade-in{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.fade-in.visible{opacity:1;transform:none}
@media(max-width:768px){.hero-inner,.about-grid,.pub-grid{grid-template-columns:1fr}.hero-photo,.nav-links{display:none}}

.hero-tech-bg{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.hero-tech-bg svg{position:absolute;inset:0;width:100%;height:100%;filter:blur(0.4px);opacity:0.6}

#media{background:var(--white)}
.media-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.media-card{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:1.4rem;text-decoration:none;display:flex;flex-direction:column;gap:.6rem;transition:border-color .2s;position:relative}
.media-card:hover{border-color:var(--blue)}
.media-source{display:flex;align-items:center;justify-content:space-between}
.media-outlet{font-family:var(--mono);font-size:.68rem;font-weight:500;color:var(--blue);letter-spacing:.07em;background:var(--blue-light);padding:.2rem .55rem;border-radius:3px}
.media-lang{font-family:var(--mono);font-size:.62rem;color:var(--muted);background:var(--bg2);padding:.18rem .5rem;border-radius:3px;letter-spacing:.05em}
.media-title{font-size:.95rem;font-weight:600;color:var(--navy);line-height:1.4}
.media-desc{font-size:.82rem;color:var(--muted);line-height:1.75;font-weight:300;flex:1}
.media-link{display:inline-flex;align-items:center;gap:.35rem;font-family:var(--mono);font-size:.7rem;color:var(--blue);margin-top:.25rem}
.media-link::after{content:'↗'}
@media(max-width:768px){.media-grid{grid-template-columns:1fr}}

.pub-card-book{display:flex;gap:1rem;align-items:flex-start}
.pub-book-cover{width:80px;min-width:80px;border-radius:5px;box-shadow:0 4px 12px rgba(0,0,0,0.12);object-fit:cover}
.pub-book-info{display:flex;flex-direction:column;gap:.45rem;flex:1}

.pub-card-img{display:flex;flex-direction:column;gap:.75rem}
.pub-card-screenshot{width:100%;border-radius:6px;object-fit:cover;max-height:160px;border:1px solid var(--line)}
.tl-logo{height:20px;width:auto;vertical-align:middle;margin-left:7px;border-radius:3px;display:inline-block;position:relative;top:-1px}.tl-logo-lg{height:32px;width:auto;vertical-align:middle;margin-left:8px;border-radius:3px;display:inline-block;position:relative;top:-2px}
.video-wrapper{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:8px;margin-bottom:.75rem;background:#000}
.video-wrapper iframe,.video-wrapper object,.video-wrapper embed{position:absolute;top:0;left:0;width:100%;height:100%}

/* ── Recommendations Carousel ── */
#recommendations{background:var(--bg)}
.rec-carousel{position:relative;overflow:hidden}
.rec-track{display:flex;transition:transform .45s cubic-bezier(.4,0,.2,1)}
.rec-slide{min-width:100%;box-sizing:border-box;padding:0 4px}
.rec-card{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:2rem 2rem 1.6rem;display:flex;flex-direction:column;gap:1rem;position:relative}
.rec-quote-mark{font-size:3.5rem;line-height:1;color:var(--blue);opacity:.18;font-family:Georgia,serif;position:absolute;top:1rem;right:1.4rem;user-select:none}
.rec-text{font-size:.9rem;color:var(--muted);line-height:1.85;font-weight:300;font-style:italic}
.rec-person{display:flex;align-items:center;gap:.9rem;margin-top:.4rem;padding-top:1rem;border-top:1px solid var(--line)}
.rec-avatar{width:46px;height:46px;border-radius:50%;background:var(--navy-mid);display:flex;align-items:center;justify-content:center;font-family:var(--display);font-size:.8rem;font-weight:700;color:#fff;flex-shrink:0;overflow:hidden}
.rec-avatar img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.rec-avatar-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-family:var(--display);font-size:.8rem;font-weight:700;color:#fff}
.rec-info{flex:1}
.rec-name{font-family:var(--display);font-size:.92rem;font-weight:600;color:var(--navy)}
.rec-title{font-size:.76rem;color:var(--muted);margin-top:.15rem;line-height:1.4}
.rec-rel{font-family:var(--mono);font-size:.65rem;color:var(--blue);margin-top:.3rem;letter-spacing:.04em}
.rec-linkedin{color:var(--blue);opacity:.6;flex-shrink:0;transition:opacity .2s}.rec-linkedin:hover{opacity:1}
.rec-controls{display:flex;align-items:center;justify-content:center;gap:1.2rem;margin-top:1.6rem}
.rec-btn{background:var(--white);border:1px solid var(--line);border-radius:50%;width:38px;height:38px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;color:var(--navy-mid);font-size:1rem}
.rec-btn:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.rec-dots{display:flex;gap:.5rem}
.rec-dot{width:7px;height:7px;border-radius:50%;background:var(--line);cursor:pointer;transition:background .2s}
.rec-dot.active{background:var(--blue)}
@media(max-width:768px){.rec-card{padding:1.4rem 1.2rem 1.2rem}}

/* ── Photo Gallery ── */
#gallery{background:var(--navy)}
#gallery .sec-label{color:rgba(255,255,255,.5)}
#gallery .sec-title{color:#fff}
#gallery .sec-line{background:var(--blue)}
.gal-filters{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:2rem;justify-content:center}
.gal-btn{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);color:rgba(255,255,255,.7);padding:.35rem 1rem;border-radius:20px;cursor:pointer;font-family:var(--mono);font-size:.72rem;letter-spacing:.05em;transition:all .2s}
.gal-btn:hover,.gal-btn.active{background:var(--blue);border-color:var(--blue);color:#fff}
.gal-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
@media(max-width:768px){.gal-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.gal-grid{grid-template-columns:1fr}}
.gal-item{cursor:pointer;border-radius:10px;overflow:hidden;position:relative;display:block;aspect-ratio:3/2}
.gal-item img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s ease, filter .45s ease;filter:saturate(0.25) sepia(0.4) hue-rotate(185deg) brightness(0.82)}
.gal-item:hover img{transform:scale(1.04);filter:none}
.gal-overlay{position:absolute;inset:0;background:linear-gradient(to top,rgba(0,0,0,.82) 0%,rgba(0,0,0,.2) 45%,transparent 70%);border-radius:10px;display:flex;flex-direction:column;justify-content:flex-end;padding:.8rem}
.gal-item:hover .gal-overlay{background:linear-gradient(to top,rgba(0,0,0,.92) 0%,rgba(0,0,0,.3) 50%,transparent 75%)}
.gal-caption{color:#fff;font-size:.78rem;font-weight:600;line-height:1.3}
.gal-sub{color:rgba(255,255,255,.65);font-size:.68rem;margin-top:.25rem;font-family:var(--mono)}
/* Lightbox */
.lb{display:none;position:fixed;inset:0;background:rgba(0,0,0,.92);z-index:9999;align-items:center;justify-content:center;flex-direction:column;padding:1.5rem}
.lb.open{display:flex}
.lb-img{max-width:90vw;max-height:75vh;object-fit:contain;border-radius:8px;box-shadow:0 8px 40px rgba(0,0,0,.6)}
.lb-caption{color:#fff;font-size:.9rem;font-weight:600;margin-top:1rem;text-align:center;max-width:700px}
.lb-sub{color:rgba(255,255,255,.6);font-size:.78rem;margin-top:.4rem;text-align:center;max-width:700px;line-height:1.6}
.lb-close{position:absolute;top:1.2rem;right:1.5rem;color:#fff;font-size:1.8rem;cursor:pointer;line-height:1;opacity:.7;transition:opacity .2s}.lb-close:hover{opacity:1}
.lb-nav{display:flex;gap:1rem;margin-top:1rem}
.lb-nav button{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);color:#fff;padding:.4rem 1.2rem;border-radius:6px;cursor:pointer;font-size:1rem;transition:background .2s}
.lb-nav button:hover{background:var(--blue)}

/* ── Sample Projects ── */
.proj-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
@media(max-width:900px){.proj-grid{grid-template-columns:repeat(2,1fr)}} @media(max-width:580px){.proj-grid{grid-template-columns:1fr}}
@media(max-width:600px){.proj-grid{grid-template-columns:1fr}}
.proj-card{background:var(--white);border:1px solid var(--line);border-radius:14px;overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .25s,transform .25s}
.proj-card:hover{box-shadow:0 8px 32px rgba(30,111,217,.12);transform:translateY(-3px)}
.proj-img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;background:#eef2f8}
.proj-body{padding:1.2rem;flex:1;display:flex;flex-direction:column;gap:.6rem}
.proj-name{font-family:var(--display);font-size:1rem;font-weight:700;color:var(--navy)}
.proj-desc{font-size:.82rem;color:var(--muted);line-height:1.75;flex:1}
.proj-tags{display:flex;flex-wrap:wrap;gap:.35rem;margin-top:.4rem}
.proj-tag{background:rgba(30,111,217,.08);color:var(--blue);font-family:var(--mono);font-size:.65rem;padding:.2rem .55rem;border-radius:20px;font-weight:500}
.proj-badge{display:inline-flex;align-items:center;gap:.3rem;font-family:var(--mono);font-size:.68rem;color:var(--muted);margin-top:.3rem}
.proj-badge svg{color:var(--blue)}


/* Hero role */
.hero-role{font-family:var(--mono);font-size:.68rem;color:rgba(180,210,255,.85);letter-spacing:.04em;margin:-.4rem 0 1.05rem;line-height:1.8;max-width:650px}
.hero-availability{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.65rem;max-width:680px;margin:0 0 2rem}
.avail-card{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:8px;padding:.85rem .95rem}
.avail-label{font-family:var(--mono);font-size:.6rem;color:rgba(100,160,255,.78);letter-spacing:.1em;text-transform:uppercase;display:block;margin-bottom:.25rem}
.avail-value{font-size:.82rem;color:rgba(255,255,255,.82);line-height:1.45;font-weight:400}
.recruiter-note{margin-top:1.4rem;max-width:680px;font-size:.82rem;line-height:1.75;color:rgba(255,255,255,.62);border-left:3px solid var(--blue);padding-left:1rem}
.career-fit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.9rem;margin-top:1rem}
.career-fit-card{background:var(--white);border:1px solid var(--line);border-radius:10px;padding:1.25rem 1.35rem}
.career-fit-card h3{font-family:var(--display);font-size:1rem;color:var(--navy);margin-bottom:.5rem}
.career-fit-card p{font-size:.83rem;color:var(--muted);line-height:1.75;font-weight:300}
.search-keywords{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
@media(max-width:768px){.hero-availability,.career-fit-grid{grid-template-columns:1fr}.hero-role{font-size:.76rem}.recruiter-note{font-size:.78rem}}